| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Direct Microwave Synthesis of 11-Type Fe(Te,Se) Polycrystalline Superconductors with Enhanced Critical Current Density |
| Bo-Jin Pan1,2, Kang Zhao1,2, Tong Liu1,2, Bin-Bin Ruan1,2, Shuai Zhang1,2, Gen-Fu Chen1,2,3, Zhi-An Ren1,2,3** |
1Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049
3Collaborative Innovation Center of Quantum Matter, Beijing 100190
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| Cite this article: |
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Bo-Jin Pan, Kang Zhao, Tong Liu et al 2019 Chin. Phys. Lett. 36 017401 |
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Abstract We report a direct microwave synthesis method for the preparation of 11-type high quality Fe(Te,Se) polycrystalline superconductors. The bulk samples are rapidly synthesized under the microwave irradiation during several minutes, with a subsequent annealing process at 400$^{\circ}\!$C. The samples exhibit a nearly single phase of the tetragonal PbO-type crystal structure with minor impurities. Morphology characterization shows high density, tight grain connectivity and large grain sizes around 100 μm with small cavities inside the sample. Resistivity and magnetization measurements both show similar superconducting transitions above 14 K. The magnetic hysteresis measurements display broad and symmetric loops without magnetic background, and a high critical current density $J_{\rm c}$ about $1.2\times10^{4}$ A/cm$^{2}$ at 2 K and 7 T is estimated by the Bean model. Compared with the solid-state reaction synthesized samples, these superconducting bulks from microwave-assisted synthesis are possibly free of the interstitial Fe due to smaller $c$-axis, higher $T_{\rm c}$ in magnetic transitions, better $M$–$H$ loops without magnetic background and greatly enhanced $J_{\rm c}$, and are promising as raw materials for the non-toxic Fe-based superconducting wires for large currents and high field applications.
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Received: 01 November 2018
Published: 25 December 2018
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| PACS: |
74.70.-b
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(Superconducting materials other than cuprates)
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74.70.Xa
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(Pnictides and chalcogenides)
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74.25.Ha
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(Magnetic properties including vortex structures and related phenomena)
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74.25.-q
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(Properties of superconductors)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11474339 and 11774402, the National Basic Research Program of China under Grant No 2016YFA0300301, the Strategic Priority Research Program of Chinese Academy of Sciences under Grant No XDB25000000, and the Youth Innovation Promotion Association of Chinese Academy of Sciences. |
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